Aleurotrachelus

Quaintance & Baker, 1914

Aleurotrachelus is a of (: ) established by Quaintance & Baker in 1914. Several are economically significant agricultural pests. Aleurotrachelus socialis is a major pest of cassava in South America, causing yield losses up to 79% through direct feeding and promotion. Aleurotrachelus trachoides, known as the solanum or pepper whitefly, attacks Solanaceae including tomato, eggplant, chili, and sweet potato across tropical and subtropical regions. Aleurotrachelus atratus infests palms, particularly coconut, and has spread to islands in the southwestern Indian Ocean. Species in this genus are characterized by distinct puparial used in taxonomic identification.

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Pronunciation

How to pronounce Aleurotrachelus: /əˌleɪəroʊˈtrækələs/

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Identification

Identification of Aleurotrachelus relies primarily on puparial characters, following standard taxonomic practice. vary in color, shape, and secretion patterns. Aleurotrachelus trachoides puparia are distinguished from other Florida whiteflies by size and shape comparisons with Bemisia tabaci, Paraleyrodes bondari, Aleurodicus rugioperculatus, and Aleurodicus dugesii. Species-level identification requires examination of microscopic puparial features including vasiform orifice structure, furrow, and wax filament arrangement.

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Distribution

The has a broad tropical and subtropical distribution. Aleurotrachelus trachoides occurs in Asia (India, Singapore), Africa (Comoros, Mayotte, Mozambique, Nigeria, Réunion, Tanzania), North America (USA: California, Florida, Hawaii, Louisiana, Texas; Mexico), Central America and Caribbean, and South America. Aleurotrachelus atratus has been recorded from the Neotropics and has expanded to islands in the southwestern Indian Ocean including La Réunion, Seychelles, and Comoros. Aleurotrachelus socialis is established in northern South America.

Diet

in this are phloem-feeding . Aleurotrachelus socialis feeds on cassava (Manihot esculenta) phloem sap. Aleurotrachelus trachoides feeds on Solanaceae including Solanum spp., Capsicum spp., tomato, eggplant, chili, okra, and sweet potato (Ipomoea batatas). Aleurotrachelus atratus feeds on palms (Arecaceae), with Cocos nucifera as the main .

Host Associations

Manihot esculenta - cassava, primary of A. socialis
Manihot flabellifolia - wild relative with to A. socialis
Manihot peruviana - wild relative with to A. socialis
Solanum spp. - of A. trachoides
Capsicum spp. - chili, pepper; of A. trachoides
Lycopersicon esculentum - tomato; of A. trachoides
Solanum melongena - eggplant; preferred of A. trachoides
Abelmoschus esculentus - okra; of A. trachoides
Ipomoea batatas - sweet potato; of A. trachoides
Cocos nucifera - coconut palm; main of A. atratus
Arecaceae - palms; A. atratus recorded on 56

Life Cycle

Aleurotrachelus atratus has a relatively long pre-imaginal development of approximately 48 days at 25–27°C. The sex ratio in field-collected A. atratus from La Réunion is approximately 1 male per 1022 females, indicating . Development includes , four nymphal (with the fourth instar being the ), and stages. Eggs close to hatching are the most susceptible stage to .

Behavior

Aleurotrachelus trachoides exhibits preference () for certain Solanaceae, with eggplant being highly preferred. On chili, with more non-glandular are favored. The does not show correlation between preference and leaf morphological traits (trichome , , palisade, thickness). Aleurotrachelus socialis reduces through direct phloem feeding and of substances promoting growth. Aleurotrachelus atratus disperse to colonize new palm hosts, facilitating rapid geographic spread.

Ecological Role

Aleurotrachelus serve as for . Eretmocerus cocois is the parasitoid of A. atratus in La Réunion. Encarsia cubensis parasitizes A. trachoides and A. atratus. including the predatory Delphastus pallidus and parasitoid Baeoentodon balios have been observed on related species in Florida. Heavy promote growth through , reducing photosynthetic capacity of host plants.

Human Relevance

Multiple are significant agricultural pests. Aleurotrachelus socialis causes up to 79% yield loss in cassava, representing a major threat to food security in South America. Aleurotrachelus trachoides damages vegetable in the Solanaceae across tropical and subtropical regions. Aleurotrachelus atratus threatens ornamental and agricultural palms, as well as natural palm in regions where effective are absent. Management relies on (neonicotinoids), though is a concern; breeding and are active research areas. The Nymphstar image analysis tool was developed specifically for high-throughput phenotyping of cassava resistance to A. socialis.

Similar Taxa

Singhiella simplexBoth are pests of Ficus; distinguished by puparial and damage patterns
Bemisia tabaciCo-occurs with A. trachoides in Florida; distinguished by puparial size and shape, and more feeding habits
Aleurodicus rugioperculatusCo-occurs with A. trachoides in Florida; distinguished by puparial characteristics and spiral patterns
Paraleyrodes bondariCo-occurs with A. trachoides in Florida; distinguished by nesting and puparial
Aleurodicus dugesiiCo-occurs with A. trachoides in Florida; larger size and distinct puparial features distinguish this giant

More Details

Taxonomic Revision

The has undergone taxonomic revision; five were transferred from Aleurotrachelus to Cohicaleyrodes and Crenidorsum based on puparial characters. Aleurotrachelus anonae and the genus Cohicaleyrodes were newly recorded from Taiwan.

Resistance Research

Wild Manihot (M. flabellifolia, M. peruviana) show to A. socialis and are being exploited for breeding cassava varieties through inter-specific crosses.

Biological Control Research

including bassiana, (strain CIAT 215 showing 67.3% mortality), and fumosoroseus have been evaluated for control of A. socialis under greenhouse conditions.